Peter Andrew Willis (born 16 February 1960 in Sheffield, England) is an English musician and songwriter, best known as a founding member of the band Def Leppard. He co-wrote many tracks and played guitar on the band's first three albums: On Through the Night, High 'n' Dry, and Pyromania, which was being recorded at the time of his departure. He was fired from Def Leppard in 1982 and replaced by Phil Collen. In 2019, Willis was inducted into the Rock and Roll Hall of Fame as a member of Def Leppard.